5. A school administrator would like to investigate the performance of faculty in twodepartments based on the evaluation and feedback of the students. Assuming thesampling error is to be limited to no more than 8% and two sample sizes should bethe same, how many students must be randomlv selected for evaluations for eachdepartment? Use a 90% confidence level..

Sample Size: The number of individual samples included in a study is referred to as sample size.…

Answered: 5. A school administrator would like to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Sample surveys on sensitiveissues can give different results depending on how the questionis asked. A University of Wisconsin study divided 2400 respondents into three groups at random. All were asked if they hadever used cocaine. One group of 800 was interviewed by phone;21% said they had used cocaine. Another 800 people were askedthe question in a one-on-one personal interview; 25% said “Yes.” The remaining 800 were allowed to make an anonymous writtenresponse; 28% said “Yes.”13 Are there statistically significant differences among these proportions? State the hypotheses, convertthe information given into a two-way table of counts, give thetest statistic and its P-value, and state your conclusions.
Is there a difference in the satisfaction rating of traditional cellphone providers who bill for service at the end of a month often under a contract and prepaid cellphone service providers who bill in advance without a contract? The accompanying table contains the satisfaction rating for 10 traditional cellphone providers and 13 prepaid cellphone service providers. What other assumption is necessary in (a)? A. Since the sample sizes are both less than 30, it must be assumed that the samples are specifically chosen and not independently sampled. B. Since the sample sizes are both less than 30, it must be assumed that the sample sizes are equal. C. Since the sample sizes are both less than 30, it must be assumed that the sample variances are equal. D. Since the sample sizes are both less than 30, it must be assumed that both sampled populations are approximately normal. Assuming that the population variances from both types of cellphone providers are equal,…
A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if she wishes the estimate to be within five percentage points with 95% confidence, assuming that (a) she uses the estimates of 22.9% male and 19.5% female from a previous year? (b) she does not use any prior estimates?
The investment firm Brown & Johnson reported that 52.7% of 300 randomly selected American households owned stocks. Does this result provide sufficient sample evidence to indicate that a majority of households in America own stocks? Use a=0.05 Please no excel. I want to know how to do the work.
4. A survey of 499 women for the American Orthopedic Foot and Ankle Society revealed that 38% wear flats to work. a. Find 99% confidence interval for the population proportion of women who wear flats to work.
What is the approximate sample size required to estimate the percentage of Americans who have earned a college degree to within 2%, with 95% confidence?
Consider the following random sample of data: 10, -10, 9, 7, 8, 3, -5, -8, -4, 86 a) What is the mean of the sample data? Round your response to at least 2 decimal places. 9.6 b) If the outlier is removed, what is the mean of the remaining sample data? Round your response to at least 2 decimal places. Number
A researcher compares depressed and nondepressed individuals to see if they differ in the number of Instagram followers they each have. For this comparison an Independent-samples t test would be appropriate. False True
Construct a sample (with at least two different values in the set) of 5 measurements whose mean is equal to the median. If this is not possible, indicate "Cannot create sample".
Suppose in a two-way ANOVA table,the total sample size N is 30, factor Ahas 3 levels, and the degrees of freedom for interaction is 8. What is the degrees of freedom for error?

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